s=1/201+1/202+1/203+.........+1/299+1/300 Chứng tỏ S>11/30
S= 1/201 + 1/202 + ... + 1/ 299 + 1/300 chứng tỏ S > 11/3o
Cho S = 1/201 + 1/202 + 1/203 + ... + 1/299 + 1/300. Chứng minh rằng 1/3 < S < 1/2
Cho S = 1/201 + 1/202 + 1/203 + ... + 1/299 + 1/300. Chứng minh rằng 1/3 < S < 1/2
1/201>1/300,1/202>1/300.................1/300=1/300 =>S>1/300.100=1/3 1/201<1/200, 1/202<1/300.................1/300<1/200=>S<1/200.100=1/2
cho a = 1/201+1/202+1/203+...+1/300. chứng minh a>11/30
Cho S = 1/101 + 1/202 + 1/203 + ... + 1/299 + 1/300. Chứng minh rằng 2/3 < S < 2
So sánh:
M= 1/201 + 1/202 + 1/203 + ............. + 1/299 + 1/300
Hãy so sánh M với 1/3
\(M=\frac{1}{201}+\frac{1}{202}+...+\frac{1}{299}+\frac{1}{300}\)
\(\Rightarrow\)Có 100 phân số
Ta có: \(\frac{1}{201}>\frac{1}{300}\)
\(\frac{1}{202}>\frac{1}{300}\)
...................
\(\frac{1}{299}>\frac{1}{300}\)
\(\frac{1}{300}=\frac{1}{300}\)
\(\Rightarrow M>\left(\frac{1}{300}+\frac{1}{300}+...+\frac{1}{300}\right)=\frac{100}{300}=\frac{1}{3}\)
Vậy....
chứng tỏ rằng :
a) 1/201 + 1/202 + 1/203+....+ 1/400 > 1/2
b) 1/201 + 1/202 + 1/203+....+ 1/400 < 1
Cho A=1/201+1/202+1/203+......+1/300.Chứng tỏ A<9/20
Giúp mik nhanh nha
cho a = 1/201+1/2002+1/203+...+1/300.chứng minh a>11/30